#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2009, Kao Cardoso Félix
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# * Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
#   copyright notice, this list of conditions and the following
#   disclaimer in the documentation and/or other materials provided
#   with the distribution.
# * Neither the name of the python-game-tools nor the names of its
#   contributors may be used to endorse or promote products derived
#   from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# POSSIBILITY OF SUCH DAMAGE.


import os
import pyglet

def image_files(path):
    """Generator with image filenames contained in path.
    """
    img_exts = (".png",)
    return (os.path.basename(filename) for filename in os.listdir(path)
            if (os.path.splitext(filename)[1] in img_exts))

def make_gradient(color_top, color_bottom):
    """Makes a gradient quad.
    """
    vdata = (('v2f', (0.0, 0.0,
                      1.0, 0.0,
                      1.0, 1.0,
                      0.0, 1.0)),
            ('c4B', tuple(color_bottom)*2 +
                    tuple(color_top)*2))

    vlist = pyglet.graphics.vertex_list(4,*vdata)

    return vlist
